JPH06211569A - Transparent aluminuous sintered compact and its production - Google Patents
Transparent aluminuous sintered compact and its productionInfo
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- JPH06211569A JPH06211569A JP50A JP670893A JPH06211569A JP H06211569 A JPH06211569 A JP H06211569A JP 50 A JP50 A JP 50A JP 670893 A JP670893 A JP 670893A JP H06211569 A JPH06211569 A JP H06211569A
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- Prior art keywords
- alumina
- sintered body
- firing
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は透光性アルミナ質焼結体
及びその製造方法に係り、特に、赤外線の窓材等として
好適な、透光性に著しく優れたアルミナ質焼結体であっ
て、その製造が容易で、低コストに提供される透光性ア
ルミナ質焼結体及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a translucent alumina-based sintered body and a method for producing the same, and more particularly to a translucent alumina-based sintered body which is suitable as a window material for infrared rays and has excellent translucency. The present invention relates to a translucent alumina-based sintered body which is easy to manufacture and can be provided at low cost, and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】従来、透光性アルミナ質焼結体は、アル
ミナ粉末に酸化マグネシウム成分を０．５％以下添加し
て混合した原料を成形し、この成形体を１７００〜１９
５０℃で真空中又は水素雰囲気中で焼成することによ
り、製造されており、これにより、透光性で高密度なア
ルミナ質焼結体を得ている（米国特許３，０２６，２１
０）。なお、この方法で得られるアルミナ質焼結体のア
ルミナ結晶粒子は５μｍ以上である。2. Description of the Related Art Conventionally, a translucent alumina-based sintered body is formed by molding a raw material obtained by adding 0.5% or less of a magnesium oxide component to alumina powder and mixing the raw material.
It is manufactured by firing at 50 ° C. in a vacuum or in a hydrogen atmosphere, whereby a translucent and high-density alumina-based sintered body is obtained (US Pat. No. 3,026,21).
0). The alumina crystal particles of the alumina sintered body obtained by this method are 5 μm or more.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の透光性アル
ミナ質焼結体の製造方法では、成形体を１７００〜１９
５０℃という非常に高い温度で焼成する必要がある上
に、その焼成雰囲気は真空又は水素雰囲気であることか
ら、雰囲気制御が必要となるため、高価な装置が必要で
あり、製造が困難で、製造コストが高くつくという問題
がある。SUMMARY OF THE INVENTION In the above-mentioned conventional method for producing a translucent alumina-based sintered body, a molded body is made to be 1700 to 19
Since it is necessary to perform firing at a very high temperature of 50 ° C. and the firing atmosphere is a vacuum or hydrogen atmosphere, it is necessary to control the atmosphere, an expensive device is required, manufacturing is difficult, There is a problem that the manufacturing cost is high.
【０００４】本発明は上記従来の問題点を解決し、１２
００〜１４５０℃という比較的低い温度にて、かつ、大
気雰囲気にて焼成することにより容易かつ安価に製造す
ることができる透光性アルミナ質焼結体及びその製造方
法を提供することを目的とする。The present invention solves the above-mentioned conventional problems, and
An object of the present invention is to provide a translucent alumina-based sintered body that can be easily and inexpensively manufactured by firing at a relatively low temperature of 00 to 1450 ° C. and in an air atmosphere, and a method for manufacturing the same. To do.
【０００５】[0005]
【課題を解決するための手段】請求項１の透光性アルミ
ナ質焼結体は、アルミナの結晶粒径が１μｍ以下であ
り、アルミナ含有量が９２重量％以上であり、かつ、密
度が３．９以上の緻密質であることを特徴とする。The translucent alumina sintered body according to claim 1 has a crystal grain size of alumina of 1 μm or less, an alumina content of 92% by weight or more, and a density of 3 or less. It is characterized by having a fineness of 0.9 or more.
【０００６】請求項２の透光性アルミナ質焼結体の製造
方法は、成形原料を成形し、得られた成形体を１２００
〜１４５０℃で焼成することにより請求項１に記載の透
光性アルミナ質焼結体を製造する方法であって、該成形
原料は、ベーマイトゾルに、焼成によりＳｉＯ2 を生成
するゾル又は塩を得られるアルミナ質焼結体中のＳｉＯ
2 含有量が０．０５〜５重量％となる量と、焼成により
ＭｇＯを生成するゾル又は塩を得られるアルミナ質焼結
体中のＭｇＯ含有量が０．０５〜０．５重量％となる量
と、焼成によりＣａＯを生成するゾル又は塩を得られる
アルミナ質焼結体中のＣａＯ含有量が０〜０．５重量％
となる量と、α−アルミナ粉末とを添加混合してなるも
のであることを特徴とする。According to a second aspect of the present invention, there is provided a method for producing a translucent alumina-based sintered body, in which a forming raw material is formed, and the obtained formed body is 1200
A method for producing the translucent alumina-based sintered body according to claim 1 by firing at -1450 ° C, wherein the forming raw material is boehmite sol, or a sol or salt that produces SiO 2 by firing. SiO in the obtained alumina sintered body
2 When the content is 0.05 to 5% by weight, the MgO content in the alumina sintered body that can obtain a sol or salt that produces MgO by firing is 0.05 to 0.5% by weight. And the content of CaO in the alumina sintered body that can obtain a sol or salt that produces CaO by firing is 0 to 0.5% by weight.
And an α-alumina powder are added and mixed.
【０００７】請求項３の透光性アルミナ質焼結体の製造
方法は、請求項２の方法において、α−アルミナ粒子の
比表面積が１０ｍ2 ／ｇ以上であることを特徴とする。The method for producing a translucent alumina-based sintered body according to claim 3 is characterized in that, in the method according to claim 2, the α-alumina particles have a specific surface area of 10 m 2 / g or more.
【０００８】以下に本発明を詳細に説明する。まず、本
発明の透光性アルミナ質焼結体の製造方法について説明
する。The present invention will be described in detail below. First, a method for manufacturing the translucent alumina-based sintered body of the present invention will be described.
【０００９】本発明の方法においては、ベーマイトを常
法に従って水を分散媒とし、酢酸等の酸で解膠すること
により調製したベーマイトゾルに、 焼成によりＳｉＯ2 を生成するゾル又は塩（以下
「ＳｉＯ2 成分」と称する。） 焼成によりＭｇＯを生成するゾル又は塩（以下「Ｍ
ｇＯ成分」と称する。） 焼成によりＣａＯを生成するゾル又は塩（以下「Ｃ
ａＯ成分」と称する。） の所定量と、α−アルミナ粉末を添加して混合して成形
原料を調製する。[0009] In the method of the present invention, boehmite using water as a dispersion medium in a conventional manner, the boehmite sol was prepared by peptization with an acid such as acetic acid, sols or salt to produce a SiO 2 (hereinafter the firing " referred to as SiO 2 component ".) sol or the salt (hereinafter to produce an MgO by firing" M
"gO component". ) Sols or salts that produce CaO by firing (hereinafter "C
"aO component". ) And the α-alumina powder are added and mixed to prepare a forming raw material.
【００１０】ここで、ベーマイトゾルの濃度には特に制
限はないが、通常の場合、アルミナ換算濃度で、３〜１
０重量％程であることが好ましい。このアルミナ換算濃
度が３重量％未満では乾燥が困難であり、１０重量％を
超えると粘度が高く取り扱い難い。Here, the concentration of boehmite sol is not particularly limited, but in the usual case, it is 3 to 1 in terms of alumina conversion concentration.
It is preferably about 0% by weight. If the alumina conversion concentration is less than 3% by weight, drying is difficult, and if it exceeds 10% by weight, the viscosity is high and handling is difficult.
【００１１】また、上記〜の各成分は、焼結性及び
粒成長に作用し、得られるアルミナ質焼結体中のＳｉＯ
2 含有量が０．０５〜５重量％となるように添加する。
ＳｉＯ2 成分の添加量が上記範囲より多くても少なくて
も透光性を失う。Further, each of the above-mentioned components (1) to (3) acts on the sinterability and the grain growth, and the SiO 2 in the obtained alumina-based sintered body is affected.
2 Add so that the content is 0.05 to 5% by weight.
If the added amount of the SiO 2 component is larger or smaller than the above range, the light transmitting property is lost.
【００１２】ＭｇＯ成分は、得られるアルミナ質焼結体
中のＭｇＯ含有量が０．０５〜０．５重量％となるよう
に添加する。ＭｇＯ成分の添加量が少ないと粒成長し、
多いとスピネル相が生成し、透光性を失う。The MgO component is added so that the content of MgO in the obtained alumina sintered body is 0.05 to 0.5% by weight. Grain growth occurs when the addition amount of MgO component is small,
If it is too much, a spinel phase is formed, and the translucency is lost.
【００１３】ＣａＯ成分は、必須成分ではないが、得ら
れるアルミナ質焼結体中のＣａＯ含有量が０．５重量％
以下の範囲で添加することができる。ＣａＯ成分の添加
量が０．５重量％を超えると粒成長が生じ、失透する。The CaO component is not an essential component, but the CaO content in the obtained alumina sintered body is 0.5% by weight.
It can be added within the following range. If the added amount of CaO component exceeds 0.5% by weight, grain growth occurs and devitrification occurs.
【００１４】いずれの場合においても、これらの添加成
分は、得られるアルミナ質焼結体中のアルミナ含有量が
９２重量％以上となるように添加する必要がある。In any case, these additive components must be added so that the alumina content in the obtained alumina sintered body is 92% by weight or more.
【００１５】なお、本発明において、ＳｉＯ2 成分とし
てはコロイダルシリカ等を、ＭｇＯ成分としてはマグネ
シアゾル、酢酸マグネシウム、塩化マグネシウム等を、
また、ＣａＯ成分としては酢酸カルシウム、塩化カルシ
ウム等を用いることができる。In the present invention, colloidal silica or the like is used as the SiO 2 component, magnesia sol, magnesium acetate, magnesium chloride or the like is used as the MgO component.
Further, as the CaO component, calcium acetate, calcium chloride or the like can be used.
【００１６】α−アルミナ粉末は、低温焼成での緻密化
を促進するために有効であり、得られるアルミナ質焼結
体中のα−アルミナ粉末由来のアルミナ含有量が１．５
〜５重量％となるように添加するのが好ましい。α−ア
ルミナ粉末の添加量が上記範囲よりも多いと透光性を失
い、少ないと緻密化しない。The α-alumina powder is effective for promoting the densification at low temperature firing, and the alumina content derived from the α-alumina powder in the obtained alumina sintered body is 1.5.
It is preferable to add it so as to be 5% by weight. When the amount of the α-alumina powder added is larger than the above range, the light-transmitting property is lost, and when the amount is small, the densification does not occur.
【００１７】また、α−アルミナ粉末はその比表面積が
１０ｍ2 ／ｇ以上、好ましくは１５〜３０ｍ2 ／ｇであ
ることが望ましい。これは比表面積の小さいα−アルミ
ナ粉末では低温焼成での緻密化促進効果が十分に得られ
ず、緻密化に必要な焼成温度が１４５０℃を超えるため
である。１４５０℃を超える高温焼成では、得られるア
ルミナ質焼結体のアルミナ結晶粒径は２〜５μｍとな
り、透光性は著しく低下し、可視光での透光性は得られ
ない。Further, alpha-alumina powder is a specific surface area of 10 m 2 / g or more, it is desirable that preferably 15 to 30 m 2 / g. This is because the α-alumina powder having a small specific surface area cannot sufficiently obtain the effect of promoting densification at low temperature firing, and the firing temperature required for densification exceeds 1450 ° C. By high-temperature firing exceeding 1450 ° C., the alumina crystal grain size of the obtained alumina sintered body becomes 2 to 5 μm, the translucency is remarkably lowered, and the translucency in visible light cannot be obtained.
【００１８】本発明においては、ベーマイトゾルに、上
述のＳｉＯ2 成分と、ＭｇＯ成分と、必要に応じてＣａ
Ｏ成分と、α−アルミナ粉末とを所定配合にて添加混合
して得られた成形原料を常法に従って成形する。例え
ば、上記成形原料に、メチルセルロース等の有機バイン
ダー、グリセリン等の可塑剤等を適当量添加してスラリ
ーを調製し、得られたスラリーをドクターブレード法に
より成形してグリーンシートを得る。In the present invention, the boehmite sol contains the above-mentioned SiO 2 component, MgO component and, if necessary, Ca.
A molding raw material obtained by adding and mixing the O component and α-alumina powder in a predetermined composition is molded according to a conventional method. For example, an organic binder such as methyl cellulose and a plasticizer such as glycerin are added to the above forming raw materials in appropriate amounts to prepare a slurry, and the obtained slurry is formed by a doctor blade method to obtain a green sheet.
【００１９】そして、得られた成形体（グリーンシー
ト）を大気中、１２００〜１４５０℃、好ましくは１２
５０〜１４５０℃で６０〜２４０分程度焼成することに
より、 アルミナ結晶粒径が１μｍ以下 アルミナ含有量が９２重量％以上 密度３．９以上の本発明の緻密質透光性アルミナ質焼結
体を得ることができる。The molded body (green sheet) thus obtained is placed in the atmosphere at 1200 to 1450 ° C., preferably 12
By firing at 50 to 1450 ° C. for about 60 to 240 minutes, an alumina crystal grain size of 1 μm or less, an alumina content of 92% by weight or more, and a dense translucent alumina sintered body of the present invention having a density of 3.9 or more. Obtainable.
【００２０】ここで、焼成温度が１２００℃未満では、
密度３．９以上といった緻密な透光性アルミナ質焼結体
を得ることができない。焼成温度が１４５０℃を超える
と結晶粒の成長が起こり、結晶粒径が１μｍを超え、透
光性を失う。When the firing temperature is less than 1200 ° C.,
It is not possible to obtain a dense translucent alumina-based sintered body having a density of 3.9 or more. When the firing temperature exceeds 1450 ° C., crystal grains grow, the crystal grain size exceeds 1 μm, and the light-transmitting property is lost.
【００２１】このようにして得られる本発明の透光性ア
ルミナ質焼結体は、波長２．５μｍの赤外領域での透過
率が７０％以上、可視光領域では波長５３０ｎｍ以上の
長波長領域で５％以上の透過率を示す、著しく透光性に
優れたものである。The translucent alumina sintered body of the present invention thus obtained has a transmittance of 70% or more in the infrared region of a wavelength of 2.5 μm and a long wavelength region of 530 nm or more in the visible light region. Shows a transmissivity of 5% or more, and is extremely excellent in translucency.
【００２２】[0022]
【作用】本発明の透光性アルミナ質焼結体及びその製造
方法によれば、緻密で著しく透光性に優れたアルミナ質
焼結体が、大気中における１２００〜１４５０℃という
低温焼成により提供される。According to the translucent alumina-based sintered body and the method for producing the same of the present invention, a dense and remarkably excellent translucent alumina-based sintered body is provided by firing at a low temperature of 1200 to 1450 ° C. in the atmosphere. To be done.
【００２３】[0023]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples below.
【００２４】実施例１ 水を分散媒として、酢酸で解膠したベーマイトゾル（ア
ルミナ換算濃度５重量％）に、ＳｉＯ2 成分としてコロ
イダルシリカアルミナ質焼結体中のＳｉＯ2 含有量が２
重量％となるように、ＭｇＯ成分として酢酸マグネシウ
ムをアルミナ質焼結体中のＭｇＯ含有量が０．５重量％
となるように、ＣａＯ成分として酢酸カルシウムを、ア
ルミナ質焼結体中のＣａＯ含有量が０．５重量％となる
ように、それぞれ添加し、更に、比表面積１７ｍ2 ／ｇ
のα−アルミナ粉末をアルミナ質焼結体中のα−アルミ
ナ粉末由来のアルミナ含有量が２重量％となるように添
加混合して成形原料を得た。Example 1 In a boehmite sol peptized with acetic acid (concentration of alumina: 5% by weight) using water as a dispersion medium, the content of SiO 2 in the colloidal silica-alumina sintered body as the SiO 2 component was 2
Magnesium acetate as the MgO component so that the MgO content in the alumina sintered body is 0.5% by weight.
So that the CaO content in the alumina-based sintered body is 0.5% by weight, calcium acetate is added as a CaO component, and the specific surface area is 17 m 2 / g.
The α-alumina powder of 1 was added and mixed so that the alumina content derived from the α-alumina powder in the alumina sintered body was 2% by weight to obtain a forming raw material.
【００２５】得られた成形原料中の同形分１００重量部
に有機バインダーとしてメチルセルロースを４０重量
部、可塑剤としてグリセリンを２０重量部添加してスラ
リーを調製し、このスラリーをドクターブレード法によ
り厚さ２００μｍのテープ状に成形してグリーンシート
を得た。A slurry was prepared by adding 40 parts by weight of methyl cellulose as an organic binder and 20 parts by weight of glycerin as a plasticizer to 100 parts by weight of the isomorphic component in the obtained molding raw material, and making a thickness of this slurry by a doctor blade method. A green sheet was obtained by molding into a tape shape of 200 μm.
【００２６】得られたシートを大気中、１３３０℃で焼
成することによりアルミナ質焼結体を得た。The obtained sheet was fired in the air at 1330 ° C. to obtain an alumina sintered body.
【００２７】得られたアルミナ質焼結体の密度を測定し
たところ、３．９５ｇ／ｃｍ3 と極めて緻密であった。
また、赤外領域での透過率は、波長２．５μｍで８０％
以上の透過率を示し、可視光領域では、５３０ｎｍ以上
の長波長側で３０％以上の透過率を示した。このアルミ
ナ焼結体をＳＥＭ観察したところ、結晶粒径が約０．８
μｍ以下であることが確認された。When the density of the obtained alumina sintered body was measured, it was 3.95 g / cm 3 , which was extremely dense.
The transmittance in the infrared region is 80% at a wavelength of 2.5 μm.
The above transmittance was shown, and in the visible light region, the transmittance was 30% or more on the long wavelength side of 530 nm or more. SEM observation of this alumina sintered body revealed that the crystal grain size was about 0.8.
It was confirmed to be less than or equal to μm.
【００２８】実施例２〜７、比較例１，２ ＳｉＯ2 ，ＭｇＯ，ＣａＯ及びα−アルミナ粒子由来の
アルミナ含有量が表１に示す割合となるように、成形原
料の配合を行なったこと以外は実施例１と同様にしてア
ルミナ質焼結体を製造し、得られたアルミナ質焼結体の
密度、透過率、結晶粒径を調べ、結果を実施例１の結果
と共に表１に示した。Examples 2 to 7, Comparative Examples 1 and 2 , except that the forming raw materials were blended so that the alumina contents derived from SiO 2 , MgO, CaO and α-alumina particles were in the ratios shown in Table 1. Manufactured an alumina sintered body in the same manner as in Example 1 and examined the density, transmittance and crystal grain size of the obtained alumina sintered body, and the results are shown in Table 1 together with the results of Example 1. .
【００２９】比較例３〜５ 実施例１〜３において、焼成温度を１４５０℃を超える
１５００℃としたこと以外はそれぞれ同様に行なってア
ルミナ質焼結体を製造し、得られたアルミナ質焼結体の
密度、透過率、結晶粒径を調べ、結果を表１に示した。Comparative Examples 3 to 5 Aluminous sintered bodies were produced in the same manner as in Examples 1 to 3 except that the firing temperature was 1500 ° C., which was higher than 1450 ° C. The body density, transmittance, and crystal grain size were examined, and the results are shown in Table 1.
【００３０】比較例６，７ 実施例１，２において、α−アルミナ粒子を添加せず、
アルミナをすべてベーマイトゾル由来のアルミナとした
こと以外は、それぞれ同様に行なってアルミナ質焼結体
を製造し、得られたアルミナ質焼結体の密度、透過率、
結晶粒径を調べ、結果を表１に示した。Comparative Examples 6 and 7 In Examples 1 and 2, without adding α-alumina particles,
Except that all alumina was alumina derived from boehmite sol, to produce an alumina-based sintered body in the same manner, the density of the obtained alumina-based sintered body, the transmittance,
The crystal grain size was examined, and the results are shown in Table 1.
【００３１】表１より次のことが明らかである。即ち、
ＳｉＯ2 成分、ＭｇＯ成分を添加しない比較例１、Ｓｉ
Ｏ2 成分を添加しない比較例２では、得られるアルミナ
質焼結体の結晶粒径が１μｍを超え、透光性に劣るもの
となる。The following are clear from Table 1. That is,
Comparative Example 1 in which SiO 2 component and MgO component are not added, Si
In Comparative Example 2 in which no O 2 component was added, the crystal grain size of the obtained alumina-based sintered body exceeded 1 μm, resulting in poor light transmission.
【００３２】また、配合は実施例のものと同様であって
も、焼成温度が高い比較例３〜５では結晶粒成長によ
り、やはり透光性に優れたアルミナ質焼結体が得られな
い。Further, even though the composition is the same as that of the embodiment, in Comparative Examples 3 to 5 in which the firing temperature is high, the alumina sintered body excellent in translucency cannot be obtained due to the crystal grain growth.
【００３３】更に、α−アルミナ粒子を添加しない比較
例６，７では、緻密化が促進せず、高密度のアルミナ質
焼結体が得られない。Further, in Comparative Examples 6 and 7 in which α-alumina particles are not added, the densification is not promoted and a high density alumina-based sintered body cannot be obtained.
【００３４】[0034]
【表１】 [Table 1]
【００３５】これに対して、実施例１〜７によれば、結
晶粒径が１μｍ以下の緻密で透光性に優れたアルミナ質
焼結体を得ることができる。On the other hand, according to Examples 1 to 7, it is possible to obtain a dense alumina sintered body having a crystal grain size of 1 μm or less and excellent in translucency.
【００３６】[0036]
【発明の効果】以上詳述した通り、本発明の透光性アル
ミナ質焼結体及びその製造方法によれば、大気中におけ
る低温焼成にて、容易かつ低コストに緻密な透光性アル
ミナ質焼結体を提供することができる。As described above in detail, according to the translucent alumina-based sintered body of the present invention and the method for producing the same, it is possible to easily and inexpensively produce a dense translucent alumina-based material by low temperature firing in the atmosphere. A sintered body can be provided.
Claims (3)
り、アルミナ含有量が９２重量％以上であり、かつ、密
度が３．９以上の緻密質透光性アルミナ質焼結体。1. A dense translucent alumina sintered body having a crystal grain size of alumina of 1 μm or less, an alumina content of 92% by weight or more, and a density of 3.9 or more.
２００〜１４５０℃で焼成することにより請求項１に記
載の透光性アルミナ質焼結体を製造する方法であって、 該成形原料は、ベーマイトゾルに、 焼成によりＳｉＯ2 を生成するゾル又は塩を、得られる
アルミナ質焼結体中のＳｉＯ2 含有量が０．０５〜５重
量％となる量と、 焼成によりＭｇＯを生成するゾル又は塩を、得られるア
ルミナ質焼結体中のＭｇＯ含有量が０．０５〜０．５重
量％となる量と、 焼成によりＣａＯを生成するゾル又は塩を、得られるア
ルミナ質焼結体中のＣａＯ含有量が０〜０．５重量％と
なる量と、 α−アルミナ粉末とを添加混合してなるものであること
を特徴とする透光性アルミナ質焼結体の製造方法。2. A molding material obtained by molding a molding raw material,
A method for producing the translucent alumina-based sintered body according to claim 1 by firing at 200 to 1450 ° C., wherein the forming raw material is boehmite sol, or a sol or salt that produces SiO 2 by firing. The content of SiO 2 in the obtained alumina sintered body is 0.05 to 5% by weight, and the sol or salt that produces MgO by firing is added to the obtained alumina sintered body in MgO content. The amount of which the amount becomes 0.05 to 0.5% by weight, and the amount of CaO content in the obtained alumina sintered body of the sol or salt that produces CaO by firing becomes 0 to 0.5% by weight. And a α-alumina powder are added and mixed, and a method for producing a translucent alumina-based sintered body is characterized.
粒子の比表面積が１０ｍ2 ／ｇ以上であることを特徴と
する透光性アルミナ質焼結体の製造方法。3. The method for producing a translucent alumina-based sintered body according to claim 2, wherein the specific surface area of the α-alumina particles is 10 m 2 / g or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50A JPH06211569A (en) | 1993-01-19 | 1993-01-19 | Transparent aluminuous sintered compact and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50A JPH06211569A (en) | 1993-01-19 | 1993-01-19 | Transparent aluminuous sintered compact and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06211569A true JPH06211569A (en) | 1994-08-02 |
Family
ID=11645801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50A Pending JPH06211569A (en) | 1993-01-19 | 1993-01-19 | Transparent aluminuous sintered compact and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06211569A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905048A (en) * | 1996-09-26 | 1999-05-18 | Japan Fine Ceramics Center | High temperature stable alumina and method of manufacturing the same |
| US6740262B2 (en) | 2000-05-09 | 2004-05-25 | Matsushita Electric Industrial Co., Ltd. | Light-transmitting sintered body, light-emitting tube and electric discharge lamp using same |
| US7396792B2 (en) * | 2002-07-10 | 2008-07-08 | Koninklijke Philips Electronics, N.V. | Transparent polycrystalline aluminium oxide |
| US7456122B2 (en) * | 2004-10-01 | 2008-11-25 | Ceranova Corporation | Polycrystalline alumina articles |
| US7897098B2 (en) | 2005-03-16 | 2011-03-01 | Osram Sylvania Inc. | High total transmittance alumina discharge vessels having submicron grain size |
-
1993
- 1993-01-19 JP JP50A patent/JPH06211569A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905048A (en) * | 1996-09-26 | 1999-05-18 | Japan Fine Ceramics Center | High temperature stable alumina and method of manufacturing the same |
| US6740262B2 (en) | 2000-05-09 | 2004-05-25 | Matsushita Electric Industrial Co., Ltd. | Light-transmitting sintered body, light-emitting tube and electric discharge lamp using same |
| US7396792B2 (en) * | 2002-07-10 | 2008-07-08 | Koninklijke Philips Electronics, N.V. | Transparent polycrystalline aluminium oxide |
| US7456122B2 (en) * | 2004-10-01 | 2008-11-25 | Ceranova Corporation | Polycrystalline alumina articles |
| WO2007001387A3 (en) * | 2004-10-01 | 2009-04-23 | Ceranova Corp | Polycrystalline alumina articles and methods of manufacture |
| US8501081B2 (en) | 2004-10-01 | 2013-08-06 | Ceranova Corporation | Polycrystalline alumina articles and methods of manufacture |
| US7897098B2 (en) | 2005-03-16 | 2011-03-01 | Osram Sylvania Inc. | High total transmittance alumina discharge vessels having submicron grain size |
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